| http://www.w3.org/ns/prov#value | - The processor 104 then, using the signal of the current estimated position, determines which tile the aircraft is currently in and then accesses databases 304, 306 and loads entries associated with tiles A, B, C and D including navigational routes W and X into the virtual blackboard 342 as illustrated in FIG. 5A. In this example, up to four tiles can be loaded into the virtual blackboard 342 at an
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